Drawing instrument.



J. W. BRAMWELL. DRAWNG INSTRUMENT.

APPLwATIoN mmm MAB. 7, 191s.

1,1 16,231 Patented Nov. 3, 1914.

2 SHEETS-SHEET 1.

THE NORRIS PETERS 0.. PHUTDUTNC Whhrlnnuvn. J. t

ATTORNEYS J. W. BRAMWELL.

DRAWING INSTRUMENT.

APPLICATION FILED MAB. 7, 1918- 1 1.1 6,23 1 g Patented Nov. 3, 1914.

2 SREETB-SHBET 2.

WITNESSES 78 1 f 8 BY A 79 MAM- INVENTOR ATTURNEYS FHS NORRIS PETERSC11. PHOTO-LITM R. WASHINGTON, D C

UNTE

JOSEPH W. BRAMWELL, OF PHILADELPHIA, PENNSYLVANIA.

DRAWING INSTRUMENT.

To all who/m, t may concern:

Be it known that I, Josnrn W. BRAM- wnLL, a citizen of the UnitedStates, residing in the city and county of Philadelphia, State ofPennsylvania, have invented a new and useful Drawing Instrument, ofwhich the following is a specification.

My invention relates to a novel construction of a drawing instrument,whereby I am enabled to utilize the blade of a T -square or similar`device and its adjuncts within a greater range of adjustment thanheretofore, provision being made for enabling the blade of the T-squareto be manipulated or adjusted to a point beyond or outside of the edgeof the drawing board or table to which the same is applied and the bladeof the Tsquare being provided with novel adjusting or adjustable devicesfor facilitating cross-hatching and making of projections in a moreaccurate and expeditious manner than heretofore, provision being alsomade for adjusting the scale carried by the T-square blade to anydesired angle with respect to said blade whereby accurate and minuteadjustments can be more readily effected than heretofore.

To the above ends my invention consists of a novel construction of adrawing instrument, the principal features of which will be hereinafterfully described and particularly pointed out in the claims.

It further consists of other novel features of construction, all as willbe hereinafter fully set forth. i j

For the` purpose of illustrating my invention, I have shown in theaccompanying drawings one form thereof which is at present preferred byme, since the same has been found in practice to give satisfactory andreliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Figure 1 represents Va plan View of a drawing instrument embodying myinvention, showing a portion of the table or drawing board to which thesame is applicable. Fig. 2 represents a section on line -m Fig. 1. Fig.3 represents an end elevation of a portion of the structure shown inFig. 1. Fig. 1 represents, on a reduced scale, a side Specification ofLetters Patent.

Application led March 7, 1913.

Patented Nov. 3, 1914.

Serial No. 752,551.

elevation of the structure illustrated in Fig. 1. Fig. 5 represents, ona slightly enlarged scale, a plan view of certain adjustable attachmentsfor the blade of the instrument. Fig. G represents a section on lineg/-y Fig. 5., certain of the parts being shown in elevation. Fig. 7represents a section on line e--s Fig. 6. Fig. S represents a sideelevation of a portion of the device employed for cross* hatching. Fig.9 represents a section on line :LJ-a" Fig. 8. Fig. 10 represents asection through the carriage and the end of the blade.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings, l designates a drawing board or table to oneedge of which, as the left-hand edge, is secured a strip 2 by means ofthe fastening devices 3 which may be of any desired number. Lldesignates arms secured to said strip by screws 5, in the presentinstance, although said arms may be cast on or be integral with saidstrip if desired. The arms l terminate in an upwardly extcndinglug (iand a laterally extending lug 7, through which passes the screw 8, uponwhich rests the bottom of the guide piece 9 of the rod` 10, said guidepiece being secured in position by the clamping" jaw 11, `which isheldin position by the screw 12. The rod 10` is preferably of about the samelength or longer than the strip 2, and the guide piece 9 is preferablylocated at both ends of said rod 10 as will be understood from Fig. il.In practice I employ but two of the arms i1f, as will be understood fromFig. 1.

13 designates a carriage movable upon the rod 10, said carriagecomprising the plate 14 having the arms 15 projecting oppositelytherefrom from the outer portion of which depends the studs or bearings1G upon which are mounted the rollers 17 there being two of saidrollers, as will be understood from Figs. 1 and 4, said rollers beinggrooved or \l'-shaped s0 as to properly contact with the rod 10.

18 designates arms also extending from the plate 111 in oppositedirections substantially parallel to the arms 1,5, but pivotally securedto said plate at the points 19, said arms 1S`having lugs 20 castthereon, in the ends of each of which lugs, the adjusting screw 21 issecured, said adjusting screw being adapted to Contact with or screwinto the lug 22 cast on or secured to the arms 15, whereby it will beapparent that by adjusting the screw 21, the rollers 23 carried on thestud or bearings 24 can be brought into proper engagement or adjustedwith respect to the rod 10, as will be understood from Figs. 1 and 2,since it will be apparent that as the screw 21 is screwed against orinto or out of the lug 22, it will cause the lug 20 and arms 18 securedthereto together with the roller 23 carried thereby to be adjustedtoward or away from the rod 10 of the opposite rollers 17, so that thecarriage 13 may move freely on the rod 10, but without any excess oflost motion with respect thereto. The plate 14 is provided with a roundopening or bearing 25 therein in which is seated a depending annularflange or the like 26 which can freely turn in said bearing and issscured to the under side of the blade 27 by means of screws or the like28, which may be four in number, the bearing 25 for the annular flangeor member 26 being tightened upon said flange by means of the screw 31which engages the lugs 29 said screw being provided with a handle 30,whereby it can be readily manipulated, and after the blade 27 is adju'sted to the desired position it can be locked therein by tighteningsaid screw 31, as is evident.

It will be seen from 'the foregoing that by properly adjusting the screw21., the roller 23 can be held against the rod 10 so that there will bepractically no lost motion as the carriage 13 travels on said rod andfurthermore by loosening the screws 12 and the clamps 11, the members 9and the rod 10 can be moved to either of their extreme positions withrespect to the arms 4 and then clamped therein vand the rod 10' can beproperly adj usted vertically by manipulating the screws 8 against themembers 9. By the proper longitudinal adjustment of the rod 10 in themannerdescribed it will be apparent that the blade 27 of the T-squarecan be used near either the extreme forward lor rear edge of the drawingboard 1, so that a wide range of adjustment is permitted to the blade 27and the latter can be locked in any desired position with'respect to thecarriage 13, by proper manipulation of the handle 30 and screw 31 aswill be apparent. The blade 27 can thus be utilized for all the purposesto which the blade of a T-square may be used and it may be furtherutilized for doing other work involving great nicety and exactness orfor cross-hatching by means of adjuncts applied thereto, which will nowbe referred to in detail.

I provide the blade 27 in the present instance with a raised portion 32,best seen in Fig. 2 to which 1 vattach in any suitable manner thelongitudinally extending strip or 4track 33 whose edges overhang saidraised portion, so that ways 34 will be formed on each side of theT-square, the edges of said strip 33 forming a track for the groovedroller 35, see Figs. 1, 5 and 6, and the two cppositely locatedpreferably smaller rollers 36 which are mounted on suitable studs orbearings carried by the plate or quadrant 37.

I do not desire to be limited to any particular manner of supporting thestuds or bearings for the rollers 35 and 36 and in Figs. 5 and 6 l haveshown one conventional form which may be employed if desired. ln orderto take up the lost motion between the roller 35 and the oppositerollers 36 with respect to the track 33 therefor, I mount the roller 35in the present instance on bearings upon the bar 38 which latter has aslot 39 guided upon the screws 40, the end of the arm 38 having securedtherein the flat spring 41, which abuts against the two pins 42, itbeing apparent from the construction seen in Fig. 5, which is a planview of the underside of the parts seen in Fig. 1, that as the roller 35is pressed to the left of the position shown in Fig. 5 the spring 41will be deflected as seen in Fig. 1 and the roller 35 as well as therollers 36 will be caused to snugly hug or engage the track 33, as isevident. l

43 designates a depending annular flange which is rotatably mounted inbearings formed with the split ring 44 which can be tightened by meansof the screw 45 if desired, said flange having an arm 46 projecting inone direction therefrom, see Figs. V1 and 6, and provided with a casing47, within which is contained the plungerl 48 having the spring 49bearing on the shoulder of said plunger, the efl'iect of said springbeing to force said plunger into one or the other of the holes 50 whichare arranged in the arc of a circle and have opposite them certainindications as 90, 30, 45, 60, etc., as will be understood from the planview in Fig. 1, so that the arm 46 and its adjuncts can be locked in thedesired position with respect to the plate or quadrant 37, by permittingthe plunger 48 to seat in the desired hole 50, said plunger beingconveniently manipulated by the handle 51 pivot'ally attached thereto.52 designates an arm also projecting from said flange 43 and inalinement with the arm 46 and having secured thereto a bearing 53 inwhich is mounted a rod 54. The extremity of the arm 52 is provided withan offset portion 55 having a slot 56 therein, through which projectsthe lug 57 attached to the member 53 said lug being in contact with theends of the screws 58, it being apparent that the member 53 is securedin position by a screw 59, so that by adjusting the screws 59 and 58,the desired adjustment of the rod 54 and its adjuncts can be attained,said rod passing through an opening in the lugs 60, which are attachedto the scale 6l whereby the i latterl can be oscillated on said rod. The

underside of said scale is provided with the rounded projections 62whereby said scale can be slightly rocked so as to bring one edge or theother toward or against the drawing paper as may be desired.

63 designates a stud or threaded stem attached to the body of the flangeor flange member' 43 upon which is movably mounted the arm 64 which isprovided with bifurcation 65, see Fig. 1, upon which is carried thescale 66 provided with suitable graduations, said scale 66 being locatedsolas to register just outside of the quadrant or scale G7, secured tothe quadrant or `carriage 37, as will be understood `from Fig. l, saidarm G4 being held in the desired position, by the nut `68 as will beunderstood from Figs. l and 6.

69 designates an arm secured to the blade 37 upon the threaded stem orstud 70 and terminating in the threaded portion 7l, which is in threadedengagement with the threaded rod 72, whiclrat its outer extremity has apinion 73 secured thereto, the outer extremity of said rod terminatingin the knurled head 74, said pinion 73, rod 72 and knurled head 74:rotating in unison.

75 designates a nut on the stud 70 for securing the arm 69 in position.

76 designates a plate in which the end of the threaded rod freelyrotates, said plate being securedto the base member 77, which has a lug78 engaging one side of the track 33, `the other side of said trackbeing `engaged by the movable jaw 79 against which bears the pivoted cam80, which is actuated by the handle 81, as will be understood from Figs.8 and 9, whereby upon actuating the handle 8l, the base member 77 andits adjuncts can be adjusted longitudinally of the track 33 according torequirements.

82 designates a plunger or detent having a stem S3 thereon and a head S4said detent being normally caused to engage the teeth of the pinion 73,by reason of the spring 85, so as to temporarily hold the threaded rod72 in desired position, saidrod, however, being capable of being freelyrotated by means of the knurled head 74.

86 designates a second scale which may be employed and which may bepivotally secured to the plate or quadrant 37 by means of the arm 87.

The raised track upon the blade and the grooved rollers upon the plateor quadrant 37 admit of said plate and the scale 6l being freely movedupon said track without lost motion and consequent disturbance of theangle at which the scale is adjusted to the blade, so that such scalomay be used similarly to an adjustable T-square. IVhen the scale is thusused and directly moved by hand, the detent can be withdrawn from thepinion to admit of `the threaded rod 72 rotating freely.

By moving the quadrant or the bearing for the threaded rod so as todisengage the latter from the threaded arm of the quadrant, the quadrantand scale can be removed from the track by` disengaging the movablysupported roller 35 from the track and lifting quadrant and scale out,without the necessity of drawing ythe same out to the end of the trackand blade. The quadrant can be placed back upon the track by placing therollers 36 against one edge of the overhang and hooking the movableroller over the other overhang.

It will beapparent that there will be a slight elasticity or resiliencyin the arm 20, best seen in Figs. l and 2, whereby any slightirregularities in the diameter of the rod l0 are permitted to be takenup as the Yrollers 23 and theiradjuncts travel with respect to said rod.

It will now be apparent that I have devised a novel and usefulconstruction of a drawing instrument, which embodies the features ofadvantage enumerated as desirable in the statement of the invention andthe `above description, and while I have, in the present instance, shownand described a preferred embodiment thereof 4which has been found inpractice to give satisfactory and reliable results, it is `to `beunderstood `that the same is susceptible of modification in variousparticulars without departing from the spirit or scope of the inventionor sacrificing any of its advantages.

Having thus described myl invention what .l claim as new and desire tosecure by Letters Patent, is zl. In a device of the character stated, astraight-edge ruler-blade having a longitudinal raised portion, a tracksecured to and having its longitudinal edges overhanging said raisedportion, a plate provided with rollers `traveling upon the oppositeedges of said track, a scale supported upon said plate, a screw-threadedrod journaled upon said blade and having means for manually rotating it,and a nut u on said plate and engaged by said threa ed rod.

2. In a device of the character stated, a straight-edge ruler-bladehaving a longitudinal raised portion, a track secured to and having itslongitudinal edges overhanging said raised portion, a plate providedwith rollers traveling upon the opposite edges of said track, a scalepivotally supported upon said plate to swing in the plane of the same, arotary screw-threaded rod having journal-support upon said blade, and anut upon said plate and engaged by said threaded rod.

3. In a device of the character stated, a straight-edge ruler-bladehaving a longitudinal raised portion, a track secured to and having itslongitudinal vedges overhanging said raised portion, a plate, groovedrollers journaled upon said plate to engage one overhanging edge of saidguide-track,a grooved roller having yielding support upon said plate toengage 'the opposite overhanging edge of the guide-track, a scalepivotally supported upon said plate to swing in the plane of the saine,a rotary screw-threaded rod having j ournal-support upon lsaid blade,and a nut upon said plate and engaged by said rod.

Il. l'na device of the character stated, a straightedge ruler-bladeformed with a 1on- .gitudinal guide-track upon its upper side, a plateprovided With' rollers travelingupon said track, a scale pivotallysupported upon said plate to swing in the plane of the same, a rotaryscrevvethreaded red having journalsupport upon said blade, a pinion uponsaid rod,va spring-detent engaging said pinion, and a nut upon saidplate and engaged by said threaded rod.

5. In a device of the character stated, a straight-edgeruler-blade4formed with a longitudinal guide-trackupon its upper side, a plateAprovided With rollers traveling upon said track, a scale pivotallysupported upon said plate to swing in the plane of vthe same, a vblockslidable upon the track and having means for clamping it upon the saine,a rotary screw-threaded rod journaled in said block, and a nut uponsaidplate and engaged by said threaded rod. i

6.l In a device of the character' stated,`a straight-edge ruler-bladeformed with a longitudinal guide-track upon its upper side, a plateprovided with rollers traveling upon said track, a scale pivotallysupported upon said plate to swing in the plane of the same, a blockslidablek upon the track and having means for clamping it upon the same,a rotary screw-threaded rod journaled in said f bloclna pinion uponYsaid rod, a 'spring-detent engaging said pinion, and a nut upon saidplate and engaged by said threaded rod.

7. In a device 'ot the characterv stated, a ystraight-ledge ruler-blade,a plate slidable upon the sanie and having an arcuate series 1 ofgraduated openings'and an annular bearting atthe center 'of such series,diametri- `cally projecting arms having an annular rotate in suchbearing, a spring-latch in one a-rrn adapted toengage the openings inthe platefand a scale'supported upon the other arm.

'8. In a device ofthecharacterstated, a straightsedge ruler-blade, aplate slidable upon the same and having an arcuate series of graduatedopenings and an an- `nular bearing at the center of such series,

vnular flange at their joined innervends fitting to rotate insuchbearing, a springlatch in one arrn adapted to engage the openings inthelplalte,"a rod extending from the end of the other a'rrn, and a scalehaving perforated lugs upon its upper side suspended upon `saidl rod,and rounded projections upon its'under side.

9. In adevice of the character stated, a `straight-edge ruler-blade, aplate slidable upon the saine, anarni pivoted to swing in vthe plane ofvsaid plate and having a slotted off-set end, a bearing movablysupported upon said end and having a lug projecting through said slot, arodsecured in said bearing, a scale supported upon said rod, and

and bearing'fagainst the lug upon the rod- Gopica` of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,Wfaahingtn, D. G.

diametrically projecting arms having an an? screws passing through thesides of the slotv fflange at -their joined inner ends fitting to

